On my walk last week, I passed by a shop dedicated to charcoal. Japanese have several uses for it. Some restaurants will place it in water to assist with water purification and your digestion. Or I see it decorating the shelf which helps to prevent dampness in the room. I bought two sticks about the size of my palm. I was surprised to discover that they are heavy, maybe the same weight as a dessert bowl. I just love how they look and have them sitting on my shelf.
There are subtle shadows between and throughout the charcoal.